Window release system

Abstract

The invention is relative to a window frame, in particular a window for a helicopter intended to fix the window onto a support. This frame includes cutting out means driven by pulling on at least a part of the window perimeter in order to divide into two at least a section of the frame and thus detach the window from the support.

I claim: 
     
       1. A window frame for securing a window to a support, the frame comprising: a joint comprising a central layer from which extends an external edge and an internal edge, the external edge being intended to be fixed onto the support and the internal edge being intended to immobilise the window; and   means for cutting out the frame which are carried by the central layer and which are driven in a direction by pulling onto at least a part of the perimeter of the window in order to divide into two at least a section of the frame and thus detach the window from the support,   characterised by the fact that the central layer comprises a longitudinal passage and the cutting out means include at least one blade and a wire, the blade being buried at least in part in the joint and the wire being housed in the longitudinal passage in order to drive the blade on a part at least of the window perimeter.   
     
     
       2. A frame in accordance with claim 1, characterised by the fact that the cutting out means comprise two blades, each of said two blades having a central part passed through by a first end of the wire, the height of the double blade being at least equal to the thickness of the central layer of the joint. 
     
     
       3. A frame in accordance with claim 2, characterised by the fact that the two blades are inclined rearwards relative to their driven direction and that the central part includes a protuberance which is situated in front of the blades and which gives a punching effect during the movement of the double blade. 
     
     
       4. A frame in accordance with claim 3, characterised by the fact that the internal edge of the joint includes a reception groove for the window and the external edge of the joint is thinned in order to be adhered to the support, so that the window, the joint and the support form an approximately flat and continuous surface. 
     
     
       5. A frame in accordance with claim 4, characterised by the fact that the wire comprises a second end passed in return means and fixed to a pulling handle, the return means being fixed to the support, approximately vertically from the central layer of the joint.